ABSTRACT
Xmodem An asynchronous file transfer protocol initially developed for CP1M personal computers. First versions used a checksum to detect errors. Later versions use the more effective CRC method. Programs typically include both methods and drop back to checksum if CRC is not present at the other end. Xmodem transmits 128 byte blocks. Xmodem-1K improves speed by transmitting 1,024 byte blocks. Xmodem-1K-G transmits without acknowledgment (for error-free channels or when modems are self-correcting), but transmission in cancelled upon any error. Refer to FDA Glossary of Computerized System and Software Development Terminology.
